Assistant Professor

LEE Keunseob
Assistant Professor
Department of Mechanical Engineering
Mechanical Engineering Course

Research fields

Today, airplanes have become indispensable method for a long distance and fast transportation of cargos and passengers. The task of improving the energy efficiency of the airplanes have attracted many researchers. Since frictional drag accounts for approximately half of the whole drag of an airplane, reduction of the frictional drag will be a great help in saving fuel and energy. Thus, it is important to understand and estimate the condition of a flow over a main wing. However, the swept wing has a disadvantage that the boundary layer tends to have a three dimensional velocity profile because the direction of the out flow and the direction of the pressure gradient are not aligned, leading to early transition to turbulence. The reason for the early laminar-turbulent transition, also, has not been clear. In my study, the spiral vortex structures which appear in the transition process of rotating-disk flow are investigated by numerical simulations. Especially, the nature of the instabilities which cause the spiral vortices to appear in the three-dimensional boundary layer are closely examined.

Fig.1 Visualization of the spiral vortices grown by the global instability on the 3D boundary layer of the rotating disk flow

Research Keywords

Fluid Mechanics, Numerical Simulation, Three-Dimensional Boundary Layers, Boundary Layer Transition

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